“The extent to which daylight exposure impacts office workers is remarkable,” said study co-author Ivy Cheung, a doctoral candidate in the Interdepartmental Neuroscience program at Northwestern University in Chicago, Illinois.

The study participants included 49 office workers, 27 who toiled away in a windowless workspace and 22 who worked as daylight streamed through windows.

The workers with windows received 173% more white light exposure during work hours and slept an average of 46 minutes more per night than the workers without a window. They also reported high levels of exercise and greater overall vitality.

“Day-shift office workers’ quality of life and sleep may be improved via emphasis on light exposure and lighting levels in current offices as well as in the design of future offices,” said Cheung.

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